When I built my system I used rigid 1' PVC and a very flexable and reenforced PVC. No hose clamps were required on the flexable PVC to nylon hose barb connections. This system has been running for a year and a half without even a drop leaked. The hose is a little expensive but I feel well worth it. It also has a bend radius of 3" for the 1" with no possibility of collapsing.
www.greenlinehose.com part#G941BW-100 for 1"